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A kind of production technology that prepares potassium chloride from carnallite

A production process, potassium chloride technology, applied in the direction of alkali metal chloride, etc., can solve the problems of low environmental friendliness, difficulty in obtaining raw materials, and low product quality, and achieve the goals of reducing environmental pollution, mature production technology, and reducing production costs Effect

Active Publication Date: 2020-03-24
QINGHAI SALT LAKE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention uses conventional carnallite to sieve and carry out reverse flotation, which solves the problems in the prior art that it is difficult to obtain raw materials that meet the process requirements, the production cost is high, the product quality is low, and the environmental friendliness is low.

Method used

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  • A kind of production technology that prepares potassium chloride from carnallite
  • A kind of production technology that prepares potassium chloride from carnallite
  • A kind of production technology that prepares potassium chloride from carnallite

Examples

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specific Embodiment

[0046] The production process for preparing potassium chloride from carnallite of the present invention will be described in detail below through several specific examples.

[0047] The present invention is implemented according to the physical characteristics of carnallite. Carnallite is a stable double salt at a temperature ranging from -21 to 167.5°C. It is a heterogeneous double salt, which can be decomposed into another solid phase when dissolved in water. The composition of pure carnallite is: KCl MgCl 2 ·6H 2 O, in actual production, the most important thing in carnallite ore is sodium chloride containing impurity salt. No matter what kind of potassium chloride production process is, how to remove sodium chloride is the main means. The present invention first separates the sodium chloride with large particles and small particles through the particle size analysis of carnallite, and then divides them into two processes for processing, and finally obtains qualified pota...

Embodiment 1

[0049] In the experiment, 10kg of carnallite particles were used as raw materials, and a 60-mesh sieve was selected with 0.25mm as the critical particle size, and then the carnallite particles were sieved once to obtain 7.94kg of primary sieve material and 2.06kg of primary sieve material . Analyze the content of each component of carnallite, the composition content analysis is shown in Table 7-1:

[0050] The critical particle size in Table 7-1 embodiment 1 is the weight of each component of the carnallite particles in the particle size range determined by 0.25mm

[0051]

[0052] After the 7.94kg primary sieve was subjected to primary demagnesization, the primary solution obtained and the primary mixed slurry were obtained. Then the primary mixed slurry is subjected to secondary screening to obtain secondary oversize and secondary undersize, and the secondary undersize can be split into primary solution and primary crude potassium. After secondary screening, the content...

Embodiment 2

[0068] In the experiment, 10kg of carnallite particles were used as the raw material, and a 60-mesh screen was selected with 0.25mm as the critical particle size, and then the carnallite particles were sieved once to obtain 6.36kg of primary sieve material and 3.64kg of primary sieve material . Analyze the content of each component of carnallite, the composition content analysis is shown in Table 8-1:

[0069] The critical particle size in Table 8-1 embodiment 1 is the weight of each component of the carnallite particles in the particle size range determined by 0.25mm

[0070]

[0071]

[0072] After 6.36kg of primary sieve material is demagnesified once, the primary solution and the primary mixed slurry obtained are obtained. Then carry out secondary screening to the primary mixed slurry to obtain the secondary oversize and the secondary undersize, and the secondary undersize is divided into the primary solution and the crude potassium. After secondary sieving, the co...

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Abstract

The invention discloses a technology for producing potassium chloride from carnallite. The technology comprises the following steps: determining a critical particle diameter of particles with the mostaverage content of the potassium chloride and selecting a standard screen mesh for sieving carnallite particles; sieving the carnallite particles into a primary oversize material and a primary undersize material by utilizing the standard screen mesh; adding a water amount for completely dissolving magnesium chloride into the primary oversize material to obtain a primary dissolving solution and primary mixed slurry; sieving the primary mixed slurry into a secondary oversize material and a secondary undersize material by utilizing the standard screen mesh; carrying out reverse flotation to obtain low-sodium carnallite and tail salt foam; adding the water amount for completely dissolving the magnesium chloride into the low-sodium carnallite to obtain a secondary dissolving solution and secondary mixed slurry; carrying out solid-liquid separation on the secondary undersize material and the secondary mixed slurry to obtain a crude potassium product; washing an obtained potassium chloride crude product to obtain a qualified potassium chloride finished product. The technology disclosed by the invention has the advantages of simplicity in operation, less investment, low energy consumptionand high yield and the quality of the prepared potassium chloride finished product is good.

Description

technical field [0001] The invention relates to the field of inorganic salt industry, in particular to a production process for preparing potassium chloride from carnallite. Background technique [0002] The salt lake chemical industry usually uses the natural evaporation of salt fields to produce carnallite, and then decomposes carnallite to produce potassium chloride. For example: low sodium chloride carnallite is obtained by reverse flotation, carnallite is decomposed with water, and the decomposition rate is controlled, which is called rate-controlled crystallization method to prepare potassium chloride. Potassium chloride and langbeinite are both important potash fertilizers and raw materials for the production of potassium sulfate. [0003] At present, there are mainly three methods for producing potassium chloride and lenbeinite by using sea salt and salt lake brine: hot melting method, flotation method, and cold decomposition crystallization method. The advantage o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/04
Inventor 张振杰唐海英刘青青刘玉明贾国安欧阳传亮韩永祥
Owner QINGHAI SALT LAKE IND
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